Ms Kim is the first member of her family to visit South Korea since the 1950-53 Korean War, amid moves by both sides to try to revive meaningful communication and perhaps end the international standoff over its nuclear program.

Ms Kim and the country’s 90-year-old nominal head of state Kim Yong Nam are scheduled to meet South Korean President Moon Jae-in on Saturday in a lunch at Seoul’s presidential palace.

For many in South Korea, the Kim Yo-jong sideshow has eclipsed the glamour of the Winter Olympics. For Ms Kim, her surprise first international appearance at centre stage, confirms that her star is on the rise.

In arrivals: Kim Yo-jong at Incheon airportCredit:
AFP PHOTO/YONHAP

Believed to be about 30, she is no longer lurking in the shadows of her elder brother, the world’s most feared dictator. Now she has been entrusted to represent the regime on his behalf.

As the youngest child of former leader Kim Jong-il, she was first spotted in public at his funeral in 2011. North Korea analysts then struggled for years to establish the identity of the young woman who moved freely behind Kim Jong-un at major public events.

It emerged that they shared the same Japanese-born mother, Ko Yong-hui. According to the Washington Post, Japanese sushi chef, Kenji Fujimoto, said that Kim Jong-il doted on his daughter, often calling her “Princess Yo-jong”.

The siblings are believed to be particularly close because they attended the same private school in Switzerland at the same time.

Police extinguish burnt portraits of North Korean leader Kim Jong-un during an anti-North Korea protest before the opening ceremony of the Pyeongchang Winter OlympicsCredit:
Edgar Su/Reuters

Michael Madden, a North Korea expert who contributes to Johns Hopkins University’s Korean Studies site, told ABC news that they lived in embassy under an alias.

“They were portrayed as the children of the domestics, the maid and the gardener,” he said.

Before sealing her position in the heart of the pariah nation, Ms Kim is said to have been well-travelled and even been on a shopping trip to Paris. She allegedly attended an Eric Clapton concert in Singapore in 2011.

Mission: Kim Yo-jongCredit:
yonhap/reuters

But she appeared to move closer to the reclusive regime’s centre of power after her uncle, Jang Song-thaek, was executed and her once powerful aunt, Kim Kyong-hui, disappeared from public view in 2013.

In recent years she has been tasked with more serious matters of state. As a senior figure in the regime’s powerful propaganda department, she attempted to craft her brother’s image as a benevolent leader.

Confidante: Kim Yo-jong seen on the right during a visit by her brother to a tree nursery in a photo released in 2015Credit:
AFP PHOTO via Korean Central News Agency

Ms Kim drew global attention again late last year when she was promoted to the ruling politburo, the country’s top decision-making body.

As one of her brother’s most trusted aides, Ms Kim on Saturday will lunch with South Korean President Moon Jae-in, the leader of a country with which her own is still technically at war.

Kim Yo-Jong, seen at the rear on a visit to a defence facility (photo released in March 2015)Credit:
afp photo via Korean Central News Agency

Although it may only be a photo-op or a chance to exchange pleasantries, the visit from Kim family royalty is so unprecedented that many speculate she may have been entrusted with a special personal message.

In the background: Kim Yo-jong pictured with North Korean leader Kim Jong-un on South Korean TVCredit:
AP

While neither Kim Yo-jong nor Kim Yong-nam are among the North Korean officials blacklisted under UN sanctions, the US Treasury Department last year included Kim Yo-jong on its list of blacklisted officials over her position as vice director of the ruling Workers’ Party’s Propaganda and Agitation Department.

The UN committee monitoring sanctions against North Korea has proposed granting an exemption for Choe, who has been on the UN sanctions blacklist since last June.